Portable power supply



FIG. 1 is a front perspective view of the portable power supply;

FIG. 2 is a front elevation view of the portable power supply;

FIG. 3 is a rear elevation view of the portable power supply;

FIG. 4 is a right side elevation view of the portable power supply;

FIG. 5 is a left side elevation view of the portable power supply;

FIG. 6 is a bottom view of the portable power supply;

FIG. 7 is a top view of the portable power supply;

FIG. 8 is a perspective view of the housing of the portable power supplywith the cover removed; and,

FIG. 9 is a perspective view of the cover of the portable power supplyremoved.

The broken lines shown represent unclaimed subject matter and form nopart of the claimed design.

The ornamental design for a portable power supply, as shown anddescribed.